Description
This
test case is provided for you to check your code before
running the assigned problem for Problem 5.Please note the settings below, and remember to change all settings back to the official problem(s) before running and handing in results.
- Grid layout: 201x41; ∆x=∆z=100 meters
- Quasi-compressible sound speed Cs = 100 meters/sec
- Integration: time step ∆t = 0.25 sec; run for 2400 steps (T=600s)
- This test includes full physics, with the initial condition U = W = P' = 0, and T' = a cool bubble in the middle of the domain.
- Initial bubble location: center (10050, 2050) meters, which is grid point (101,21).
- Initial bubble specification: center magnitude -15 degrees K,
"radii" in X: 4000 m; Z: 1000 m.
- Diffusion: done for all k=[1,...,nz] for U and Theta
(changed from original handout).
- Diffusion coefficient = 50 (for U, W) for all cases; diffusion for theta = 40.0 (for all, Lax-W and PL)
- Results are included below for different
advection options (Lax-Wendroff and Piecewise
Linear with and without monotonic slopes)
Test case results
- Plots below use contour intervals of 2.0 (for U and W), 1.0 (for Theta'), and 25.0 (for P').
- Partial text output from these runs: Lax-Wendroff,
Piecewise
linear (non-monotonic)
| Pgm
#5 test case D |
T=0 | T=100 | T=200 | T=400 | T=600 | |
|---|---|---|---|---|---|---|
| Step N=0 | N=400 | N=800 | N=1600 | N=2400 | ||
| Lax -Wendroff |
T |  |
 |
 |
 |
 |
| U | zero field |
 |
 |
 |
 |
|
| W | zero field |
 |
 |
 |
 |
|
| P' | zero field |
 |
 |
 |
 |
|
| PL: Piecewise Linear (non- monotonic) |
T |  |
 |
 |
 |
 |
| U | zero field |
 |
 |
 |
 |
|
| W | zero field |
 |
 |
 |
 |
|
| P' | zero field |
 |
 |
 |
 |
|
| PL: Monotonic Piecewise Linear (this is not required!) |
T |  |
 |
 |
 |
 |
| U | zero field |
 |
 |
 |
 |
|
| W | zero field |
 |
 |
 |
 |
|
| P' | zero field |
 |
 |
 |
 |
|